The first screenshot shows the result of a search for the word WINDOWS in all HTM and HTML files of the directories C:\ and D:\. The number on the left hand side of the search result specifies the byte position of the found text phrase in the file.

The next screenshot shows how the file SETUP.HTML is displayed in the preview window afterwards. I have used the external HTML-converter in this example, which preserves the formatings. The internal HTML-converter is faster, but it converts the HTML-document in a pure text file without formatings.